Circulation in steam-boilers



UNITED STATES PATENT OFFICE.

SAMUEL P. HINOKLEY AND MORRILL s. PIERCE, OF BATH, MAINE.

CIRCULATION IN STEAM-BOILERS.

SPECIFICATION forming part of Letters Patent No. 547,787, dated October 15, 1895.

Application filed January 21, 1895. Serial No. 535,743. (No model.)

To aZZ whom it may concern:

Be it known that we, SAMUEL P. HINCKLE and MORRILL S. PIERCE, citizens of the United States, residing at Bath, in the county of Sagada-hoc and State of Maine, have invented certain new and useful Improvements in Circulation in Steam-Boilers; and we do hereby de clare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to steam-boilers, and more particularly to that class of boilers known as Scotch boilers, or boilers provided with tubes through which the products of combustion pass.

It consists of a device by means of which the circulation of water in the boiler, when the fire is first started or when the fire is about to be started, may be-produoed or accelerated before the heat from the furnace has had an appreciable efi'feot upon the great body of water in the boiler, means in connection with the same for cutting off the use of this device in case of accident, and a device by which the pipes are carried from the outside to the interior of the boiler.

In the drawings, Figure 1 is a side elevation of the boiler with our improvement attached, a portion of the front of the boiler being broken out to show the interior of the firebox. Fig. 2 is an end view of the back of the boiler, the end being removed to show the interior of the fire-box.

The shellA is of the ordinary construction. Within it is the tube-sheet a, provided with ordinary tubingb b, and the fire-box c c, with grate d cZ, as usual.

e represents the feed-water pipe, which enters the siphon g near the upper part of the boiler, (see Fig. 1,) the point of the pipe 6 extending considerably more than one-half the length of the siphon g into the same. The siphon g communicates with the pipe it within the boiler. (Shown in Fig. 1 in dotted lines.)

The siphon g has on the middle of its lower side an outlet which is connected with the pipe is, which extends outside the boiler nearly its whole length, when it enters the rear of the fire-box or its back connection and passes downward in a coil or by a zigzag arrangement of pipes through the lower part of the boiler and outside the same to a point near the center of the length of the boiler, whereit terminates in the check-valve Z, which in turn is connected either with the pipe which enters directly into the lower part of the boiler, or, as shown in Fig. 1, with the siphon m, the upper part of which is connected with and entersthe lower part of the boiler. This siphon m may be connected at its rear end with a pipe n, the end of which projects into the siphonm considerably more than one-half of the length of the latter. The pipe k is provided near the point at which it is connected with the siphon g, with a check-valve o, beyond which is a stop-cock 10, (see Fig. 1,) or this stop-cock may be placed on the other side of the check-valve. The pipe is is also provided with a stop-cock s at a point just before it enters the valve Z, and the pipe 72 is also provided with a stop-cock p just outside the siphon m. The valve 0 is so constructed that it automatically closes the pipe 70 against the passage of water descending from the siphon g, as also is the case with the valve Z.

As shown, the improvement may be used either with or without a subsidiary steam-supply. When used without such asupply, the fire is started in the fire-box, and heating the waterin the coil of the pipe It causes it to ascend and pass through the siphon g and pipe 72. into the boiler, its place being necessarily supplied by the cold water from the lower part of the boiler passing through the valve Z. As the fire increases, the rapidity of the circulation is increased and the heat is distributed more quickly throughout the mass of water than would be the case when a boiler not provided with this attachment is used. In case a steam-supply is at hand, it is connected with the pipe at and the valve t is opened, admitting thesteam into the siphon m. The passage of steam through the siphon m causes a vacuum, which tends to draw the water from the lower part of the boiler through the passage of water until itcould be repaired: In passing the pipe 70 through the double walls or water-space of the boiler, we make use of a hollow stay-bolt, as shown in Figs. 1 and 2.

The stay-bolt for this purpose is providedwith an opening through itslength slightly larger than the diameter of the exterior of the pipe which it surrounds and issecured in place in the same manner as' ordinary staybolts.

that we claim is- 1. In combination with a tubularboiler, a

pipe extending from the interior of thelower part of the boiler throughthe shell of the boiler, entering and passing through the co1nbustion chamber to the outside thereoifland thence extending to the upperpart of the boiler where it unites with the feed-water pipe, whereby the water from the boilercin oulating in said first named'pipe enters the boiler in conjunction with the feed-water, substantially as described.

2. In combination with a tubular boiler, a

pipeextending from theinteriorot the lower part of theboiler throughthe shell of the boiler, entering and passing through the coinbustion chamber to the outside thereof, and thence extending to the upper part of the boiler where it unites with the feed-water pipe, said first named pipe communicating, at or near its exit from the lower part of the boiler, with a steam pipe connecting with a steam supply independent of said boiler, substantially as described.

3.In combination with a tubular boiler, a pipe extending from the interior of the lower part of the boilervthrough the shell of the boiler, entering and passing through the coinbustion chamberto the outside thereof, and thence extending to theupper" part of the boiler where it unites with the feed water pipe,

lower end with a stop cock whereby, in case of a break in said pipe, the feed water is antomatically shut elf-therefrom and it may be closed against-the entrance of water from the lower part of the boiler, substantially as described. In testimonythatwe claim theforegoing as our inventionwe have hereunto set our hands thisIOth day ofJauuary, A. D. 1895.

SAMUEL P. IIINCKLEY; MORRILL S. PIERCE; In presence of- J OHNH. RAYMOND, J OHN II; RAYMOND.

saidfirst named pipe being provided near-its upper end with a cheekvalve and near its 

